Journal Papers

1. J.P. Vielma, S. Ahmed, and G.L. Nemhauser. " A note on : "A Superior Representation Method for Piecewise Linear Functions" by Li, Lu, Huang and Hu," accepted for publication in INFORMS Journal on Computing, 2009.
2. S. Ahmed, O. Gozbasi, M. Savelsbergh, I. Crocker, T. Fox, and E. Schreibmann. " A fully-automated Intensity-Modulated Radiation Therapy planning system," accepted for publication in INFORMS Journal on Computing, 2009.
3. S. Ahmed and A. Atamturk. "Maximizing a class of submodular utility functions," accepted for publication in Mathematical Programming, 2009 (preprint).
4. Z.C. Taskin, J.C. Smith, S. Ahmed, and A.J, Schaefer. "Cutting plane algorithms for solving a robust edge-partition problem," accepted for publication in Discrete Optimization, 2009.
5. J.P. Vielma, S. Ahmed and G.L. Nemhauser. "Mixed-integer models for nonseparable piecewise linear optimization: Unifying framework and extensions," accepted for publication in Operations Research, 2009 (preprint).
6. F. Kilinc-Karzan, A. Toriello, S. Ahmed, G.L. Nemhauser, and M. Savelsbergh. "Approximating the stability region for binary mixed-integer programs," accepted for publication in Operations Research Letters, 2009 (preprint).
7. K. Huang and S. Ahmed. "A stochastic programming approach for planning horizons of infinite horizon capacity planning problems," accepted for publication in European Journal of Operational Research, 2008.
8. P. Schutz, A. Tomasgard and S. Ahmed. "Supply chain design under uncertainty using sample average approximation and dual decomposition," accepted for publication in European Journal of Operational Research, 2008.
9. B. Pagnoncelli, S. Ahmed, and A. Shapiro. "The sample average approximation method for chance constrained programming: theory and applications," Journal of Optimization theory and Applications, vol.142, pp.399-416, 2009 (preprint).
10. J. Luedtke, S. Ahmed and G.L. Nemhauser. "An integer programming approach for linear programs with probabilistic constraints," Mathematical Programming, vol.122, pp.247, 2010 (preprint).
11. S. Ahmed, D. Filipovic, and G. Svindland. "A note on natural risk staistics,"Operations Research Letters, vol.36, pp.662-664, 2008 (preprint).
12. J. Luedtke and S. Ahmed. "A sample approximation approach for optimization with probabilistic constraints," SIAM Journal on Optimization, vol.19, pp.674-699, 2008 (preprint).
13. K. Huang and S. Ahmed. "The value of multi-stage stochastic programming in capacity planning under uncertainty," Operations Research, vol.57, pp.893-904, 2009 (preprint).
14. Y. Guan, S. Ahmed and G.L. Nemhauser. "Cutting planes for multi-stage stochastic integer programs," Operations Research, vol.57, pp.287-298, 2009 (preprint).
15. W. Wang and S. Ahmed. "Sample average approximation of expected value constrained stochastic programs," Operations Research Letters, vol.36, pp.515-519, 2008 (preprint).
16. J.P. Vielma, S. Ahmed and G.L. Nemhauser. "A lifted linear programming branch-and-bound algorithm for mixed integer conic quadratic programs," INFORMS Journal on Computing, vol.20, pp.438-450, 2008 (preprint).
17. K. Huang and S. Ahmed. "On a multi-stage stochastic programming model for inventory planning," to appear in INFOR, 2008.
18. S. Ahmed, U. Cakmak and A. Shapiro. "Coherent risk measures in inventory problems," European Journal of Operational Research, vol.182, pp.226-238, 2007 (preprint).
19. Y. Guan, S. Ahmed and G. L. Nemhauser. "Sequential pairing of mixed integer inequalities," Discrete Optimization, vol.4, pp.21-39, 2007 (preprint).
20. S. Ahmed. "Convexity and decomposition of mean-risk stochastic programs ,"  Mathematical Progamming, vol.106, pp.433-446, 2006 (preprint).
21. Y. Guan, S. Ahmed, A. J. Miller, and G. L. Nemhauser. "On formulations of the stochastic uncapacitated lot-sizing problem," Operations Research Letters, vol.34, pp.241-250, 2006.
22. M.-S. Cheon, S. Ahmed and F. Al-Khayyal. "A branch-reduce-cut algorithm for the global optimization of probabilistically constrained linear programs," Mathematical Progamming, vol.108, pp.617-634, 2006 ( preprint ).
23. Y. Guan, S. Ahmed, G.L. Nemhauser and A.J. Miller. "A branch-and-cut algorithm for the stochastic uncapacitated lot-sizing problem," Mathematical Programming, vol.105, pp.55-84, 2006 ( preprint ).
24. S. Ahmed and Y. Guan. "The Inverse Optimal Value Problem," Mathematical Programming, vol.102, pp.91-110, 2005 ( preprint ).
25. T. Santoso, S. Ahmed, M. Goetschalckx, and A. Shapiro. "A Stochastic Programming Approach for Supply Chain Network Design under Uncertainty," European Journal of Operational Research , vol.167, pp.96-115, 2005 ( preprint ).
26. A. Shapiro and S. Ahmed. "On a class of minimax stochastic programs," SIAM Journal of Optimization, vol.14, pp.1237-1249, 2004 ( preprint ).
27. S. Ahmed, M. Tawarmalani, and N. V. Sahinidis. "A Finite Branch and Bound Algorithm for Two-stage Stochastic Integer Programs,'' Mathematical Programming , vol.100, pp.355-377, 2004 ( preprint ).
28. S. Takriti and S. Ahmed. "On Robust Optimization of Two-Stage Systems," Mathematical Programming, vol.99, pp.109-126, 2004 ( preprint ).
29. S. Ahmed and R. Garcia. "Dynamic Capacity Acquisition and Assignment under Uncertainty," Annals of Operations Research, vol.124, pp. 267-283, 2003 ( preprint ).
30. B. Verweij, S. Ahmed, A. J. Kleywegt, G. Nemhauser, and A. Shapiro. "The Sample Average Approximation Method Applied to Stochastic Routing Problems: A Computational Study," Computational and Applied Optimization , vol.24, pp.289-333, 2003 ( preprint ).
31. G. Parija, S. Ahmed, and A. J. King. "Bridging the Gap between Stochastic Integer Programming and Mixed-Integer Solver Technologies," INFORMS Journal on Computing, vol.16, 2004 ( preprint ).
32. S. Ahmed and N. V. Sahinidis. "An Approximation Scheme for Stochastic Integer Programs Arising in Capacity Expansion,'' Operations Research , vol.51, pp.461-471, 2003 ( preprint ).
33. S. Ahmed, A. J. King, and G. Parija. "A Multi-Stage Stochastic Integer Programming Approach for Capacity Expansion under Uncertainty,'' Journal of Global Optimization, vol. 26, pp.3-24, 2003 ( preprint ).
34. M. Tawarmalani, S. Ahmed, and N. V. Sahinidis. "Product Disaggregation and Relaxations of Mixed-Integer Rational Programs," Optimization and Engineering , vol.3, no. 3, pp. 281-303, 2002.
35. M. Tawarmalani, S. Ahmed, and N. V. Sahinidis. "Global Optimization of 0-1 Hyperbolic Programs,'' Journal of Global Optimization, vol. 24, no. 2, pp. 385-417, 2002. 
36. S. Ahmed and N. V. Sahinidis. "Selection, Acquisition, and Allocation of Manufacturing Technology in a Multi-Product Environment,'' European Journal of Operational Research, vol. 189, no. 3, pp. 807-821, 2008 .
37. S. Ahmed and N. V. Sahinidis. "Analytical Investigations of the Process Planning Problem,'' Computers & Chemical Engineering, vol. 23, pp. 1605-1621, 2000.
38.  S. Ahmed, N. V. Sahinidis, and E. N. Pistikopoulos. "An Improved Decomposition Algorithm for Process Planning under Uncertainty,'' Computers & Chemical Engineering, vol. 23, pp. 1589-1604, 2000.
39. S. Ahmed and N. V. Sahinidis. "Robust Process Planning under Uncertainty,'' Industrial & Engineering Chemistry Research , vol. 37, pp. 1883-1892, 1998.

Submitted

1. S. Shen, J.C. Smith, and S. Ahmed. "Expectation and Chance-Constrained Models and Algorithms for Insuring Critical Paths,'' submitted for publication, 2009.
2. A. Parmar, S. Ahmed and J. Sokol. "An integer programming approach to the OSPF weight setting problem," submitted for publication, 2006.
3. N. Kong, A. Schaefer, and S. Ahmed. "Totally unimodular stochastic programs," submitted for publication, 2006.

Book Chapters

1. S. Ahmed and A. Shapiro. "Solving chance-constrained stochastic programs via sampling and integer programming," in Tutorials in Operations Research, Z.-L. Chen and S. Raghavan (eds.), INFORMS, 2008.(preprint)
2. M. Goetschalckx, S. Ahmed, A. Shapiro, and T. Santoso. "Strategic design of robust global supply chains under uncertainty,” in Progress in Material Handling Research: 2004, R. Meller et al. (eds.), The Material Handling Institute, NC, pp. 103-117, 2004.
3. S. Ahmed and N. V. Sahinidis. "Techniques in Long Range Planning of Chemical Manufacturing Systems," in Computer-Aided Design, Engineering, and Manufacturing: Systems Techniques and Applications, Volume V: The Design of Manufacturing Systems, C. T. Leondes (ed.), CRC Press LLC, Boca Raton, FL, pp.1-25, 2001.
4. S. Ahmed and N. V. Sahinidis. "Chemical Process Planning,'' in The Encyclopedia of Optimization, C. A. Floudas and P. M. Pardalos (eds.), Kluwer Academic Publishers, Vol.1, pp.246-252, 2001.

Others

1. S. Ahmed. " Smooth minimization of two-stage stochastic linear programs ," ISyE Technical Report OPT-2006-1, 2006.
2. S. Ahmed. " Mean-risk objectives in stochastic programming ," ISyE Technical Report, 2004.
3. S. Ahmed and A. Shapiro. "The Sample Average Approximation Method for Stochastic Programs with Integer Recourse " ISyE Technical Report, 2002.
4. S. Takriti and S. Ahmed. "Managing Short-Term Electricity Contracts under Uncertainty: A Minimax Approach ," ISyE Technical Report, 2002. 
5. S. Ahmed. "Semiconductor Tool Planning via Multi-Stage Stochastic Programming," Proceedings of the International Conference on Modeling and Analysis in Semiconductor Manufacturing, Mackulak et al. (eds.), pp. 153-157, 2002.
6. S. Ahmed and M. A. Haque. "Multi-facility Retail Locationing Using p-Choice Models,'' ISyE Technical Report, 2001.
7. S. Ahmed. "Review of Introduction to Stochastic Programming by J. R. Birge and F. Louveaux.'' Interfaces, vol. 28, pp. 79, 1998.
8. A. J. King, S. Takriti, and S. Ahmed. " Issues in Risk Modeling for Multi-Stage Systems ," IBM Research Report No. RC-20993, 1997.